I just noticed the latest update for the Android App to 80.18.23 and upon launching it then invoked the update of each Sonos device to OS Version 84.1-63110.
Unfortunately the new App hung at the “Finishing update” stage.
I left it for 30 minutes and nothing happened but the spinning wheel.
The Android App and the devices are all reporting that they are at the correct level now so I presume it hung whilst cleaning up but it doesn’t fill you with confidence.